#6 All Aboard! Britain's Finest Locomotive A4 History Awaits! The LNER A4 Class – Speed, Style, and Steam Perfection 🚂 Few steam locomotives have ever captured the imagination quite like the LNER A4 Class. Designed by Sir Nigel Gresley for the London and North Eastern Railway, these streamlined Pacifics were built for one purpose – speed. Introduced in the 1930s, the A4s combined cutting-edge aerodynamics with raw power, hauling prestigious expresses such as The Flying Scotsman and The Coronati